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GTD Analysis for Evanescent Modal Excitation
Hiroshi SHIRAI Yoshiyasu MATSUDA Ryoichi SATO
IEICE TRANSACTIONS on Electronics
Publication Date: 1997/01/25
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Theory
GTD, geometrical theory of diffraction, evanescent mode, parallel plane waveguide, modal excitation,
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A simple extension to treat evanescent modal excitation at the aperture of a parallel plane waveguide is shown here by GTD diffracted rays with complex propagation angles. Numerical comparison with other solution confirmed that our simple solution can be used for modal excitation estimation below the cut-off frequency.